OAO VNIIMT

Yekaterinburg, Russia

OAO VNIIMT

Yekaterinburg, Russia
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Povolotskii V.Y.,OAO VNIIMT | Lantsov Y.V.,OAO OEMK | Plotnikova S.Y.,OAO OEMK
Steel in Translation | Year: 2011

A model of direct iron production by pellet reduction in a shaft furnace has been developed. This model includes the material and energy balances of all the main components of the reduction system (shaft furnace, reformer, etc.) and is based on ARM Tekhnologa software for the analysis and optimization of the reduction conditions at OAO OEMK. The calculation results may be used in the reconstruction of the reduction system and implemented in practice. To predict the reduction conditions and control the direct production of iron, a determinate model of the heat and mass transfer and gas dynamics in the bed is added to ARM Tekhnologa software. This supplementary model simulates the reduction dynamics of a pellet in the shaft furnace and expands the scope for calculating new reduction conditions, so as to boost product output and quality. © 2011 Allerton Press, Inc.


Butkarev A.A.,OAO VNIIMT | Butkarev A.P.,OAO VNIIMT | Ptichnikov A.G.,OAO Chelyabinskii Metallurgicheskii Kombinat | Tumanov V.P.,OAO Chelyabinskii Metallurgicheskii Kombinat
Steel in Translation | Year: 2015

Thermal analysis of the air heater for 2038-m3 blast furnace 1 at OAO Chelyabinskii Metallurgicheskii Kombinat confirms that the hot-blast temperature may be increased by at least 30–40°C on introducing an optimal control subsystem designed by OAO VNIIMT. This reduces expenditures on coke by 75 million rub/yr. © 2015, Allerton Press, Inc.


Zainullin L.A.,OAO VNIIMT | Kalganov M.V.,OAO VNIIMT | Kalganov D.V.,OAO VNIIMT | Loshkarev N.B.,OAO VNIIMT | And 2 more authors.
Steel in Translation | Year: 2015

Electric heaters with radiant-convective heat transfer between the heating elements and the walls of the sealed housing are developed. Industrial tests show that intensification of the heat liberation from the coils by ventilation using a circulatory fan increases their life by 30–50% in comparison with existing devices, by reducing the temperature of the elements. The sealed housing permits their use in convective furnaces with protective or aggressive atmospheres. © 2015, Allerton Press, Inc.


Yaroshenko Y.G.,Ural Federal University | Lipunov Y.I.,OAO VNIIMT | Zakharchenko M.V.,Ural Federal University | Eismondt K.Y.,OAO VNIIMT | Nekrasova E.V.,OAO VNIIMT
Steel in Translation | Year: 2015

The cooling of complex bodies in a tank of oil poses a fire hazard, is expensive, and does not permit regulation of the heat transfer in regions of the body with different characteristics. The rail fishplate is an asymmetric component for which such cooling is employed. An environmentally safe technology for the controlled water cooling of fishplates has been proposed at OAO VNIIMT, along with the corresponding equipment. The use of water as the coolant eliminates the formation of harmful environmental emissions, as well as the cost of repeated oil purchases. Industrial tests permit identification of cooling conditions such that the mechanical properties of the fishplates will meet the standard requirements. Linearity of the fishplate is ensured by separate supply of water to each sprayer in each section of the device. The test results provide the basis for selection of the best cooling conditions when the system is used in industrial production lines, so as replace cooling in a tank of oil. © 2015, Allerton Press, Inc.


Zainullin L.A.,OAO VNIIMT | Spirin N.A.,Ural Federal University | Kalganov M.V.,OAO VNIIMT | Kalganov D.V.,OAO VNIIMT
Steel in Translation | Year: 2015

A circulatory convective furnace is developed for the heat treatment of long parts. This furnace, which has a complete heat-transfer cycle (heating, holding, and cooling), is characterized by periodic reversal of gas motion. Experimental control characteristics are presented for reversible devices based on centrifugal fans. The results may be used in the development of circulatory convective furnaces with a complete heat-transfer cycle. © 2015, Allerton Press, Inc.


Zainullin L.A.,OAO VNIIMT | Loshkarev N.B.,OAO VNIIMT | Kalganov M.V.,OAO VNIIMT | Kalganov D.V.,OAO VNIIMT
Steel in Translation | Year: 2014

An aerodynamic system with periodic reversal of the hot-gas flow is proposed for a convective furnace, so as to ensure uniform temperature distribution over long parts. The hot gas is driven by a reversible device consisting of two centrifugal fans mounted in opposite directions. Experimental data are obtained for the hydraulic losses of fans of different types with reverse flow of air. The best centrifugal fans for use in reversible devices are identified. © 2014, Allerton Press, Inc.


Butkarev A.A.,OAO VNIIMT
Steel in Translation | Year: 2011

Improvements in the control of pellet heat treatment in conveyer roasting machines are considered. It is shown that the consumption of power and natural gas may be reduced, and the productivity may be increased, by means of various control subsystems, including optimal control of the process and parameter stabilization. © 2011 Allerton Press, Inc.


Samoilovich Y.A.,OAO VNIIMT
Steel in Translation | Year: 2015

A physicomathematical model is proposed for the thermal stress of steel rollers quenched after inductive heating. The model involves numerical solution of a system of interrelated nonlinear heat-conduction and thermoviscoelasticity equations. It takes account of the kinetics of austenite decomposition and the specifics of inductive heating. The validity of the model is confirmed by comparing the calculated stress in a roller (diameter 210 mm) with experimental data obtained by the Saks method. © 2015, Allerton Press, Inc.


Samoilovich Y.A.,OAO VNIIMT
Steel in Translation | Year: 2010

Melt fluxes in the liquid core of thin solidifying steel slabs are analyzed, for two different nozzle configurations. The reliability of the analysis is ensured by taking account of turbulence on the basis of a two-parameter Launder-Spalding model and also by the universal numerical finite-element method. © 2010 Allerton Press, Inc.


Samoilovich Y.A.,OAO VNIIMT
Steel in Translation | Year: 2010

The removal of alumina particles from steel is considered for two configurations of a (90-100)-t intermediate ladle. Mass transfer is analyzed on the basis of simultaneous solution of the convective-diffusion equations of the inclusions in the melt and equations describing melt flow within the ladle, taking account of turbulence. An innovation in the assessment of the mass-transfer coefficient between the alumina particles and the refining flux is the concept of wave flow of a thin liquid-flux film as it interacts with the rough surface of the sintered slag. The removal of alumina particles (10-100 μm) from the metal is assessed. © 2010 Allerton Press, Inc.

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